小白求助 关于返回引用当左值的问题

琴长不过时光

测试的函数

#define _CRT_SECURE_NO_WARNINGS
#include "iostream"
#include "MyVector.cpp"
using std::endl;
using std::cout;
using std::cin;

class Teacher
{
private:
        int age;
        char name[32];
public:
        Teacher()
        {
                this->age = 33;
                strcpy(this->name, " ");
        }
public:
        Teacher(const char* name, int age)
        {
                this->age = age;
                strcpy(this->name, name);
        }
        void printT()
        {
                cout << this->age << " " << this->name << endl;
        }
};

void main()
{
        //MyVector<T>::MyVector<T>(int len)
        MyVector<Teacher> tArray(4);
        Teacher t1("t1", 22), t2("t2", 32), t3("t3", 42), t4("t4", 52);
        tArray[0] = t1;
        tArray[1] = t2;
        tArray[2] = t3;
        tArray[3] = t4;
        for (int i = 0; i < 4; i++)
        {
                Teacher tmp = tArray[i];
                tmp.printT();
        }


        system("pause");
}

#include "MyVector.h"

template <typename T>
int MyVector<T>::getLen()
{
        return this->m_len;
}

//MyVector<Teacher> tArray(4);
template <typename T>
MyVector<T>::MyVector<T>(int len)
{
        this->m_len = len;
        this->m_space = new T[m_len];
        //this->m_space = new Teacher[m_len];
}

template <typename T>
MyVector<T>::MyVector<T>(const MyVector<T>& mv)
{

}

template <typename T>
MyVector<T>::~MyVector<T>()
{

}

template <typename T>
MyVector<T>& MyVector<T>::operator=(MyVector& mv)
{

}

template <typename T>
T& MyVector<T>::operator[](int index)
{
        return this->m_space[index];
}

template <typename T>
ostream& operator<<<T>(ostream& out, MyVector<T>& mv)
{


}

#pragma once
#include "iostream";
using std::endl;
using std::cout;
using std::cin;
using std::ostream;

template <typename T>
class MyVector;

template <typename T>
ostream& operator<<(ostream& out, MyVector<T>& mv);

template <typename T>
class MyVector
{
private:
        int m_len;
        T* m_space;
public:
        int getLen();
public:
        MyVector(int len);
        MyVector(const MyVector& mv);
        ~MyVector();
public:
        MyVector& operator=(MyVector& mv);
        T& operator[](int index);

public:
        friend ostream& operator<<<T>(ostream& out, MyVector<T>& mv);
};

这是三个类 测试类TestVector     MyVector.h   MyVector.cpp  

为啥
        tArray[0] = t1;
        tArray[1] = t2;
        tArray[2] = t3;
        tArray[3] = t4;
显示报错  而在MyVector类中 写了下面的代码 就不报错了 这是当左值吗？左值返回的是引用  谁是左值？是这个返回的this->m_space[index]当左值吗？
template <typename T>
T& MyVector<T>::operator[](int index)
{
        return this->m_space[index];
}

琴长不过时光

顶

琴长不过时光

顶